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On 3 Nov 97, William Falkenbach wrote:
> Well, people things are still at standstill as to why this car of
> mine (71 Square FI) won`t start. In response to Jim, from your list
> of helpful hints here are the results: Ignition is not the problem.
> Spark is reaching all cyls. Nothing is grounding where it`s not
> supposed to. Pulled the brain and ran all the checks you suggested.
> One curious note; after checking the ground side of the fuel
> injector plugs,I got continuity, which is correct. Then I checked
> the other terminal, each one back to the correct corresponding
> terminal on the brain. Each one checked out as per schematic. Then I
> checked corresponding terminals of injector plugs 1,2,3 or 4 again,
> but this time instead of touching it back to the brain as in my last
> sentence I went to ground. They all made continuity. Is this normal?
This doesn't sound right, but it also sounds like you are doing
something wrong. You should leave the connectors on the injectors
and measure the resistance from the brain connector thru each
injector to ground. You should get 2.5-3 Ohms for each injector.
> I have no schematic of the brain so I can only guess. All voltage
> checks from starter are correct, 12v
Is that 2x 12 V all the time plus one more 12 V when the starter is
cranking?
. I know that for an internal
> combustion engine not to run the problem can only be spark,
> compression or fuel. I`m betting its an electrical problem relating
> to the fuel injection.
>
> When you turn the key to fire the engine, it will fire for a second
> and then thats it. The throttle switch works as I can hear the
> injectors making the clicking sound. When I turn the engine on to
> the run position, and then floor the throttle 4 or 5 times, when it
> fires, it lasts just a bit longer indicating to me the cyls. have
> just a bit more fuel in them. I`ve tried hotwiring the fuel pump
> with a switch, so I can turn it on manually(in fact this is how I`ve
> run the car the last 40,000 miles)so I know fuel is available to the
> injectors. Its just not allowed to enter for some reason!! Please
> don`t suggest a new fuel pump relay, its got one.
Did you check that the resistance of both trigger points alternated
from zero to very large as the engine is turned over? Do this
measurement through the cable harness in order to test both the
harness and the trigger points. My guess is that your problem is
here.
Jim
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Melissa Kepner Jim Adney
Laura Kepner-Adney
jadney@vwtype3.org
Madison, Wisconsin
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